IQ can be used to give scientific justification to our internalized biases.
I don't want to limit your rights, because you are X. I want to limit your rights because I belong to Y, and as Y does better than X on IQ tests, it is only prudent that we know better what is good for you. I am also not interested in listening to counter-arguments coming from people whose IQ is below 99.
Also, in extreme cases, it can be used to push further policies such as eugenics (the bad kind that everyone has in mind when they hear the word "eugenics"):
Ah... I forgot to say that X shouldn't have the right to have children. No offense meant, but we want to avoid dims out breeding brights. Also, keep your stupid daughter away from my son, as I really don't want my own children to pollute genetic purity of our kind.
From the OP:
What are your best arguments against the reality/validity/usefulness of IQ?
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appeals that would limit testing or research even if IQ's validity is established are not [welcome].
Emphasis mine.
We all know the standard "that's racist" argument already, newerspeak is clearly asking for a factual reason why measures of general intelligence are not real / invalid / not useful. Not to mention that the post did not make any claims about, or even mention, heredity of intelligence or race / gender differences in intelligence.
Haven't had one of these for awhile. This thread is for questions or comments that you've felt silly about not knowing/understanding. Let's try to exchange info that seems obvious, knowing that due to the illusion of transparency it really isn't so obvious!